CA2017683C - Wound dressing - Google Patents
Wound dressingInfo
- Publication number
- CA2017683C CA2017683C CA002017683A CA2017683A CA2017683C CA 2017683 C CA2017683 C CA 2017683C CA 002017683 A CA002017683 A CA 002017683A CA 2017683 A CA2017683 A CA 2017683A CA 2017683 C CA2017683 C CA 2017683C
- Authority
- CA
- Canada
- Prior art keywords
- wound dressing
- pad
- dressing according
- sheet
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000010410 layer Substances 0.000 claims abstract description 31
- 239000000853 adhesive Substances 0.000 claims abstract description 26
- 230000001070 adhesive effect Effects 0.000 claims abstract description 26
- 239000006260 foam Substances 0.000 claims abstract description 14
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 13
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 6
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 6
- 239000002344 surface layer Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229920000297 Rayon Polymers 0.000 claims description 3
- 239000003522 acrylic cement Substances 0.000 claims description 3
- KCWDJXPPZHMEIK-UHFFFAOYSA-N isocyanic acid;toluene Chemical compound N=C=O.N=C=O.CC1=CC=CC=C1 KCWDJXPPZHMEIK-UHFFFAOYSA-N 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 abstract description 2
- 229920000570 polyether Polymers 0.000 abstract description 2
- 206010052428 Wound Diseases 0.000 description 43
- 208000027418 Wounds and injury Diseases 0.000 description 43
- 210000002310 elbow joint Anatomy 0.000 description 4
- 210000000629 knee joint Anatomy 0.000 description 4
- 230000005660 hydrophilic surface Effects 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 208000005230 Leg Ulcer Diseases 0.000 description 2
- 238000001266 bandaging Methods 0.000 description 2
- 230000035876 healing Effects 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 210000000416 exudates and transudate Anatomy 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/02—Adhesive bandages or dressings
- A61F13/0203—Adhesive bandages or dressings with fluid retention members
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00361—Plasters
- A61F2013/00365—Plasters use
- A61F2013/00387—Plasters use skin protection
- A61F2013/004—Plasters use skin protection from liquid water
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00361—Plasters
- A61F2013/00727—Plasters means for wound humidity control
- A61F2013/00731—Plasters means for wound humidity control with absorbing pads
- A61F2013/0074—Plasters means for wound humidity control with absorbing pads containing foams
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00361—Plasters
- A61F2013/00727—Plasters means for wound humidity control
- A61F2013/00731—Plasters means for wound humidity control with absorbing pads
- A61F2013/00744—Plasters means for wound humidity control with absorbing pads containing non-woven
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00361—Plasters
- A61F2013/00855—Plasters pervious to air or vapours
- A61F2013/00863—Plasters pervious to air or vapours with pores
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00361—Plasters
- A61F2013/00855—Plasters pervious to air or vapours
- A61F2013/00885—Plasters pervious to air or vapours impervious, i.e. occlusive bandage
- A61F2013/00889—Plasters pervious to air or vapours impervious, i.e. occlusive bandage waterproof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/84—Accessories, not otherwise provided for, for absorbent pads
- A61F13/8405—Additives, e.g. for odour, disinfectant or pH control
- A61F2013/8408—Additives, e.g. for odour, disinfectant or pH control with odour control
- A61F2013/842—Additives, e.g. for odour, disinfectant or pH control with odour control with active charcoal
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Materials For Medical Uses (AREA)
Abstract
The invention provides a wound dressing comprising a pad of soft polyurethane foam one surface layer of which is hydrophilic and a backing layer of which is hydrophobic and a sheet or strip of a soft conformable polyether foam having an adhesive on one surface thereof. The surface of said pad opposite the hydrophobic layer is secured to said sheet or strip by said adhesive and said sheet or strip overlaps said pad to enable the pad to be secured in position with said hydrophilic layer in contact with a wound by means of said adhesive.
Description
20I 76~3 1 94024-64 SJD:jy WOUND DRESSING
The present invention relates to wound dressings.
It is known from United Kingdom Patent Specifications Nos. 1417962 and 1450201 to provide a wound dressing comprising a pad of polyurethane material one surface layer of which has been modified to render it hydrophilic and the remainder of which is hydrophobic. Such wound dressings are used by placing the pad over the wound with the hydrophilic surface of the pad in contact with the wound and then securing the pad in place by adhesive strapping or by bandaging thereover. It is also known from United States Patent No. 4730611 to provide a wound dressing comprising a foamed polyurethane as aforesaid positioned on a porous non-woven fibrous sheet of a larger selected size and having an adhesive on the side contacting the hydrophobic side of said pad so that the dressing presents the hydrophilic side and the adhesive for use in contact with a wound and the area surrounding the wound.
With wound dressings of the kind aforesaid it is desirable that the hydrophilic surface of the pad remain in close contact with the wound to remove exudates and to promote healing.
With the known wound dressings this is difficult to achieve, particularly where the wound dressing is applied to an area subject to considerable movement such as an elbow joint or a knee joint, since conventional adhesive strapping and conventional 2017~83 2 94024-64 SJD:jy bandaging either do not hold the pad in close contact with the wound over an extended period of time or can quickly work loose.
The wound dressing comprising a polyurethane pad positioned on a porous non-woven fibrous sheet in accordance with the aforesaid United States patent has little elasticity and therefore does not readily conform for any extended period of time to difficult areas such as elbow joints and knee joints.
It is also desirable that a wound dressing should be impervious to water to enable a patient to bathe or shower without wetting or contaminating the wound but at the same time should be sufficiently porous to enable moisture to evaporate therethrough to maintain an environment under the dressing which will promote rapid healing of a wound. These requirements are not met by the known wound dressings.
The present invention therefore has as its object to provide a wound dressing which will overcome the limitations of X
201768~
conformable even to difficult areas of the body such as elbow joints or knee joints, which is water impermeable and which will allow moisture to 5 evaporate therethrough.
A wound dressing comprising a pad of soft-polyurethane foam one surface layer of which is hydrophillic and a backing layer of which is hydrophobic and a sheet or strip of a soft conformable polyetherurethane 10 foam having an adhesive on one surface thereof, the surface of said pad opposite said hydrophillic layer being secured to said sheet or strip by said adhesive and said sheet or strip overlapping said pad to enable said pad to be secured in position with said hydrophillic layer in contact with a wound by means of said adhesive, wherein the polyetherurethane foam is a 15 predomin~ntly closed cell foam having a pore size of 0.1 to 0.6 mm, such that the dressing is waterproof but water vapour permeable.
Said sheet or strip may overlap said pad on two opposite sides thereof although it is preferrred that the sheet or strip overlap said pad around the 20 whole of the periphery thereof.
A release paper or film may be applied over said adhesive, said release paper or film being removable prior to application of the wound dressing over a wound.
Said pad may have a thickness from 3 to 10 mm, preferably from 4 to 6 mm.
f.~ ~
4 94024-64 SJD:jy Said pad may be compressed around the periphery.
Preferably, the compressed region extends inwardly for 5 mm to 10 mm from the edge, suitably 6 mm to 8 mm from the edge.
Preferably, the periphery is compressed to have a thickness of from 0.1 mm to 1.0 mm, suitably from 0.2 mm to 0.6 mm.
Said sheet or strip may be formed from a high density polyetherurethane foam, preferably a predominantly closed cell blocked toluene di-isocyanate polyetherurethane foam. Said polyetherurethane foam may have a pore size of 0.1 to 0.6 mm.
The sheet or strip may have an elongation of 200% to 300%, preferably 240% to 270%. The sheet or strip may have a thickness of 0.2 to 1.0 mm, preferably 0.4 to 0.8 mm.
The said adhesive is preferably an acrylic adhesive but may be any of the other adhesives approved for medical use.
If desired, said pad may comprise at or adjacent said opposite surface thereof a layer impregnated with activated carbon for adsorbing organic odours. Thus, said impregnated layer may comprise a layer of non-woven viscose fibres on to which activated carbon granules have been sprayed. Said impregnated layer may be sandwiched between said sheet or strip and the hydrophobic backing layer of the pad or between two layers of hydrophobic polyurethane foam. Dressings comprising X
20176~3 94024-64 SJD:jy such an impregnated layer are useful when dressing wounds which give off an offensive odour as is the case, for example, with certain leg ulcers.
The wound dressing of the present invention may, in conventional manner, be sterile and be packaged in a sterile pack. For example said dressing and said pack may have been sterilised by gamma irradiation after packaging of the dressing in said pack.
The invention will be more particularly described with reference to the accompanying drawings, in which Figure 1 is an isometric view of a wound dressing according to the present invention, Figure 2 is a fragmentary sectional elevation on an enlarged scale of the wound dressing of Figure 1, Figure 3 is a fragmentary sectional elevation on an enlarged scale of a modified wound dressing according to the present invention, Figure 4 is a fragmentary sectional elevation of another modification of a wound dressing according to the invention, and 201 768~
6 94024-64 SJD:jy Figure 5 is a fragmentary sectional elevation of a further embodiment of a wound dressing according to the invention.
Referring to Figure 1 and 2 of the drawings it will be seen that the wound dressing illustrated therein comprises a pad 1 of soft polyurethane foam one surface layer 2 of which is hydrophilic and the remainder of which is hydrophobic and forms a backing layer 3 and a sheet or strip 4 of a soft conformable polyether foam having an adhesive 5 on one surface thereof, the surface of the hydrophobic layer 3 being secured to the sheet or strip 4 by said adhesive 5 and the sheet or strip 4 overlapping the pad 1 as shown at 6 to enable the pad 1 to be secured in position with the hydrophilic layer 2 in contact with a wound means of the adhesive 5. As will be seen from Figure 1, the sheet or strip 4 overlaps the pad 1 around the whole of the periphery thereof. A release paper or release film 7, indicated by broken lines in Figure 1, is applied over the adhesive 5 and over the pad 1 and is removable prior to application of the dressing over a wound.
The pad 1 has a thickness of from 3 to 10 mm, preferably 4 to 6 mm.
Referring to the embodiment shown in Figure 5, the pad 1 is preferably compressed around its periphery. The compressed region 9 may extend inwardly for 5 mm to 10 mm from the edge, 201768~
7 94024-64 SJD:jy suitably 6 mm to 8 mm from the edge. Preferably, the periphery is compressed to have a thickness of from 0.1 to 1.0 mm, suitably from 0.2 to 0.6 mm.
Compressing the periphery of the pad 1 increases the effective border width without increasing overall dimensions or reducing the pad 1 area, to enable a more secure fixation of the wound dressing on the patient. Further, the release papers 7 thereby sits flat across the full width of the adhesive surfaces.
The compression of the periphery of the pad 1 is achieved prior to assembly of the wound dressing. The pad 1 is placed, with the hydrophilic surface layer 2 uppermost, centrally onto a forming tray with a cut out 14 mm smaller in all dimensions. The forming tray and wound dressing are then placed onto the lower, unheated, platen of a heat press. The lower platen is raised at a pressure in the range of 50 to 5000N/m2, preferably 500 to 1500N/m2, against the upper platen which is heated to a temperature of 140C to 250C, preferably 180C to 200C. After a period of time, preferably between 10 seconds and 90 seconds - suitably about 20 seconds - the pressure is released and the bottom platen lowered. The wound dressing so produced will have a periphery reduced in thickness.
The sheet or strip 4 in either embodiment is formed from a high density predominantly closed cell blocked toluene di-isocyanate polyetherurethane foam. Preferably, the 8 94024-64 SJD:jy polyetherurethane foam from which the sheet or strip 4 is formed has a pore size of 0.1 to 0.6 mm and an elongation of 200% to 300%, preferably to 240% to 270%. The sheet or strip 4 may have a thickness of from 0.2 to 1.0 mm, preferably from 0.4 to 0.8 mm.
The corners of the sheet or strip 4 are preferably rounded, to prevent them from lifting up when the wound dressing is in use.
The adhesive 5 is an acrylic adhesive although other adhesives approved for medical use may be used if desired.
The wound dressing illustrated in Figures 1 and 2 is highly conformable to different parts of the body, even to difficult parts such as elbow joints or knee joints, is waterproof so that a patient wearing the dressing can bathe or shower without danger of wetting or contaminating a wound and is sufficiently porous to enable moisture to evaporate therethrough.
As shown in Figures 3 and 4, in which like parts have been given like reference numerals, the pad 1 in either embodiment may include a layer 8 of non-woven fibres, e.g., viscose fibres, impregnated with granules of activated carbon.
Thus, as shown in Figure 3, the layer 8 may be provided between the hydrophobic layer 3 and the layer of adhesive 5 or, as shown in Figure 4, the layer 8 may be sandwiched between hydrophobic layers 3a, 3b of the pad 1. A dressing incorporating the layer 8 is particularly useful for dressing wounds which give off an 20l76a3 - 9 94024-64 SJD:jy offensive odour, as is the case, for example, with certain leg ulcers and other wounds.
The present invention relates to wound dressings.
It is known from United Kingdom Patent Specifications Nos. 1417962 and 1450201 to provide a wound dressing comprising a pad of polyurethane material one surface layer of which has been modified to render it hydrophilic and the remainder of which is hydrophobic. Such wound dressings are used by placing the pad over the wound with the hydrophilic surface of the pad in contact with the wound and then securing the pad in place by adhesive strapping or by bandaging thereover. It is also known from United States Patent No. 4730611 to provide a wound dressing comprising a foamed polyurethane as aforesaid positioned on a porous non-woven fibrous sheet of a larger selected size and having an adhesive on the side contacting the hydrophobic side of said pad so that the dressing presents the hydrophilic side and the adhesive for use in contact with a wound and the area surrounding the wound.
With wound dressings of the kind aforesaid it is desirable that the hydrophilic surface of the pad remain in close contact with the wound to remove exudates and to promote healing.
With the known wound dressings this is difficult to achieve, particularly where the wound dressing is applied to an area subject to considerable movement such as an elbow joint or a knee joint, since conventional adhesive strapping and conventional 2017~83 2 94024-64 SJD:jy bandaging either do not hold the pad in close contact with the wound over an extended period of time or can quickly work loose.
The wound dressing comprising a polyurethane pad positioned on a porous non-woven fibrous sheet in accordance with the aforesaid United States patent has little elasticity and therefore does not readily conform for any extended period of time to difficult areas such as elbow joints and knee joints.
It is also desirable that a wound dressing should be impervious to water to enable a patient to bathe or shower without wetting or contaminating the wound but at the same time should be sufficiently porous to enable moisture to evaporate therethrough to maintain an environment under the dressing which will promote rapid healing of a wound. These requirements are not met by the known wound dressings.
The present invention therefore has as its object to provide a wound dressing which will overcome the limitations of X
201768~
conformable even to difficult areas of the body such as elbow joints or knee joints, which is water impermeable and which will allow moisture to 5 evaporate therethrough.
A wound dressing comprising a pad of soft-polyurethane foam one surface layer of which is hydrophillic and a backing layer of which is hydrophobic and a sheet or strip of a soft conformable polyetherurethane 10 foam having an adhesive on one surface thereof, the surface of said pad opposite said hydrophillic layer being secured to said sheet or strip by said adhesive and said sheet or strip overlapping said pad to enable said pad to be secured in position with said hydrophillic layer in contact with a wound by means of said adhesive, wherein the polyetherurethane foam is a 15 predomin~ntly closed cell foam having a pore size of 0.1 to 0.6 mm, such that the dressing is waterproof but water vapour permeable.
Said sheet or strip may overlap said pad on two opposite sides thereof although it is preferrred that the sheet or strip overlap said pad around the 20 whole of the periphery thereof.
A release paper or film may be applied over said adhesive, said release paper or film being removable prior to application of the wound dressing over a wound.
Said pad may have a thickness from 3 to 10 mm, preferably from 4 to 6 mm.
f.~ ~
4 94024-64 SJD:jy Said pad may be compressed around the periphery.
Preferably, the compressed region extends inwardly for 5 mm to 10 mm from the edge, suitably 6 mm to 8 mm from the edge.
Preferably, the periphery is compressed to have a thickness of from 0.1 mm to 1.0 mm, suitably from 0.2 mm to 0.6 mm.
Said sheet or strip may be formed from a high density polyetherurethane foam, preferably a predominantly closed cell blocked toluene di-isocyanate polyetherurethane foam. Said polyetherurethane foam may have a pore size of 0.1 to 0.6 mm.
The sheet or strip may have an elongation of 200% to 300%, preferably 240% to 270%. The sheet or strip may have a thickness of 0.2 to 1.0 mm, preferably 0.4 to 0.8 mm.
The said adhesive is preferably an acrylic adhesive but may be any of the other adhesives approved for medical use.
If desired, said pad may comprise at or adjacent said opposite surface thereof a layer impregnated with activated carbon for adsorbing organic odours. Thus, said impregnated layer may comprise a layer of non-woven viscose fibres on to which activated carbon granules have been sprayed. Said impregnated layer may be sandwiched between said sheet or strip and the hydrophobic backing layer of the pad or between two layers of hydrophobic polyurethane foam. Dressings comprising X
20176~3 94024-64 SJD:jy such an impregnated layer are useful when dressing wounds which give off an offensive odour as is the case, for example, with certain leg ulcers.
The wound dressing of the present invention may, in conventional manner, be sterile and be packaged in a sterile pack. For example said dressing and said pack may have been sterilised by gamma irradiation after packaging of the dressing in said pack.
The invention will be more particularly described with reference to the accompanying drawings, in which Figure 1 is an isometric view of a wound dressing according to the present invention, Figure 2 is a fragmentary sectional elevation on an enlarged scale of the wound dressing of Figure 1, Figure 3 is a fragmentary sectional elevation on an enlarged scale of a modified wound dressing according to the present invention, Figure 4 is a fragmentary sectional elevation of another modification of a wound dressing according to the invention, and 201 768~
6 94024-64 SJD:jy Figure 5 is a fragmentary sectional elevation of a further embodiment of a wound dressing according to the invention.
Referring to Figure 1 and 2 of the drawings it will be seen that the wound dressing illustrated therein comprises a pad 1 of soft polyurethane foam one surface layer 2 of which is hydrophilic and the remainder of which is hydrophobic and forms a backing layer 3 and a sheet or strip 4 of a soft conformable polyether foam having an adhesive 5 on one surface thereof, the surface of the hydrophobic layer 3 being secured to the sheet or strip 4 by said adhesive 5 and the sheet or strip 4 overlapping the pad 1 as shown at 6 to enable the pad 1 to be secured in position with the hydrophilic layer 2 in contact with a wound means of the adhesive 5. As will be seen from Figure 1, the sheet or strip 4 overlaps the pad 1 around the whole of the periphery thereof. A release paper or release film 7, indicated by broken lines in Figure 1, is applied over the adhesive 5 and over the pad 1 and is removable prior to application of the dressing over a wound.
The pad 1 has a thickness of from 3 to 10 mm, preferably 4 to 6 mm.
Referring to the embodiment shown in Figure 5, the pad 1 is preferably compressed around its periphery. The compressed region 9 may extend inwardly for 5 mm to 10 mm from the edge, 201768~
7 94024-64 SJD:jy suitably 6 mm to 8 mm from the edge. Preferably, the periphery is compressed to have a thickness of from 0.1 to 1.0 mm, suitably from 0.2 to 0.6 mm.
Compressing the periphery of the pad 1 increases the effective border width without increasing overall dimensions or reducing the pad 1 area, to enable a more secure fixation of the wound dressing on the patient. Further, the release papers 7 thereby sits flat across the full width of the adhesive surfaces.
The compression of the periphery of the pad 1 is achieved prior to assembly of the wound dressing. The pad 1 is placed, with the hydrophilic surface layer 2 uppermost, centrally onto a forming tray with a cut out 14 mm smaller in all dimensions. The forming tray and wound dressing are then placed onto the lower, unheated, platen of a heat press. The lower platen is raised at a pressure in the range of 50 to 5000N/m2, preferably 500 to 1500N/m2, against the upper platen which is heated to a temperature of 140C to 250C, preferably 180C to 200C. After a period of time, preferably between 10 seconds and 90 seconds - suitably about 20 seconds - the pressure is released and the bottom platen lowered. The wound dressing so produced will have a periphery reduced in thickness.
The sheet or strip 4 in either embodiment is formed from a high density predominantly closed cell blocked toluene di-isocyanate polyetherurethane foam. Preferably, the 8 94024-64 SJD:jy polyetherurethane foam from which the sheet or strip 4 is formed has a pore size of 0.1 to 0.6 mm and an elongation of 200% to 300%, preferably to 240% to 270%. The sheet or strip 4 may have a thickness of from 0.2 to 1.0 mm, preferably from 0.4 to 0.8 mm.
The corners of the sheet or strip 4 are preferably rounded, to prevent them from lifting up when the wound dressing is in use.
The adhesive 5 is an acrylic adhesive although other adhesives approved for medical use may be used if desired.
The wound dressing illustrated in Figures 1 and 2 is highly conformable to different parts of the body, even to difficult parts such as elbow joints or knee joints, is waterproof so that a patient wearing the dressing can bathe or shower without danger of wetting or contaminating a wound and is sufficiently porous to enable moisture to evaporate therethrough.
As shown in Figures 3 and 4, in which like parts have been given like reference numerals, the pad 1 in either embodiment may include a layer 8 of non-woven fibres, e.g., viscose fibres, impregnated with granules of activated carbon.
Thus, as shown in Figure 3, the layer 8 may be provided between the hydrophobic layer 3 and the layer of adhesive 5 or, as shown in Figure 4, the layer 8 may be sandwiched between hydrophobic layers 3a, 3b of the pad 1. A dressing incorporating the layer 8 is particularly useful for dressing wounds which give off an 20l76a3 - 9 94024-64 SJD:jy offensive odour, as is the case, for example, with certain leg ulcers and other wounds.
Claims (17)
1. A wound dressing comprising a pad of soft-polyurethane foam one surface layer of which is hydrophillic and a backing layer of which is hydrophobic and a sheet or strip of a soft conformable polyetherurethane foam having an adhesive on one surface thereof, the surface of said pad opposite said hydrophillic layer being secured to said sheet or strip by said adhesive and said sheet or strip overlapping said pad to enable said pad to be secured in position with said hydrophillic layer in contact with a wound by means of said adhesive, wherein the polyetherurethane foam is a predominantly closed cell foam having a pore size of 0.1 to 0.6 mm, such that the dressing is waterproof but water vapour permeable.
2. A wound dressing according to claim 1, wherein said sheet or strip overlaps said pad on opposite sides thereof.
3. A wound dressing according to claim 1, wherein said sheet or strip overlaps said pad around the whole of the periphery thereof.
4. A wound dressing according to claim 1, wherein a release paper or film is applied over said adhesive, said release paper or film being removable prior to application of the wound dressing over a wound.
5. A wound dressing according to claim 1, wherein said pad has a thickness of from 3 to 10 mm.
6. A wound dressing according to claim 1 wherein said pad has a thickness of from 4 to 6 mm.
7. A wound dressing according to claim 1, wherein said pad is compressed around the periphery.
8. A wound dressing according to claim 7, wherein the compressed region extends inwardly for 5 mm to 10 mm from the edge of the pad.
9. A wound dressing according to claim 7, wherein the periphery is compressed to have a thickness of from 0.1 mm to 1.0 mm.
10. A wound dressing according to claim 1, wherein said sheet or strip is high density.
11. A wound dressing according to claim 10, wherein said sheet or strip is formed from a blocked toluene di-isocyanate polyetherurethane foam.
12. A wound dressing according to claim 10, or wherein said sheet or strip has an elongation of 200% to 300%.
13. A wound dressing according to claim 1, wherein said sheet or strip has a thickness of from 0.2 mm to 1.0 mm.
14. A wound dressing according to claim 1, wherein said adhesive is an acrylic adhesive.
15. A wound dressing according to claim 1, wherein said pad comprises at or adjacent said opposite surface thereof a layer impregnated with activated carbon for absorbing organic odours.
16. A wound dressing according to claim 15, wherein said impregnated layer comprises a layer of non-woven viscose fibres on to which activated carbon granules have been sprayed.
17. A wound dressing according to claim 15 or 16, wherein said impregnated layer is sandwiched between two layers of hydrophobic polyurethane foam.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8904131A GB2228682B (en) | 1989-02-23 | 1989-02-23 | Wound dressing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2017683A1 CA2017683A1 (en) | 1991-11-28 |
| CA2017683C true CA2017683C (en) | 1994-09-06 |
Family
ID=10652186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002017683A Expired - Fee Related CA2017683C (en) | 1989-02-23 | 1990-05-28 | Wound dressing |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5154928A (en) |
| EP (1) | EP0457977B1 (en) |
| AT (1) | ATE118683T1 (en) |
| AU (1) | AU621754B1 (en) |
| CA (1) | CA2017683C (en) |
| DE (1) | DE69017199T2 (en) |
| DK (1) | DK0457977T3 (en) |
| ES (1) | ES2071017T3 (en) |
| GB (1) | GB2228682B (en) |
| GR (1) | GR3015841T3 (en) |
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| CA2092581C (en) * | 1992-12-22 | 2003-10-14 | Judith K. Faass | Self-adhesive nonwoven elastic compressible composite material |
| US5356372A (en) * | 1993-12-01 | 1994-10-18 | Ludlow Corporation | Occlusive pressure-reducing wound dressing |
| CA2122660A1 (en) * | 1993-12-14 | 1995-06-15 | John Philip Vukos | Absorbent article having a body adhesive |
| CA2146615C (en) * | 1994-04-08 | 2007-06-05 | George B. Finley | Conformable adhesive bandages |
| ATE194481T1 (en) * | 1994-04-08 | 2000-07-15 | Johnson & Johnson Consumer | CONFORMABLE ADHESIVE BANDAGES |
| US5695777A (en) * | 1994-05-10 | 1997-12-09 | Medtronic, Inc. | Absorptive wound dressing for wound healing promotion |
| GB2290031B (en) * | 1994-06-08 | 1998-09-30 | Seton Healthcare Group Plc | Wound dressings |
| GB9411429D0 (en) * | 1994-06-08 | 1994-07-27 | Seton Healthcare Group Plc | Wound dressings |
| US5578317A (en) * | 1995-03-31 | 1996-11-26 | Mulder; Gerit D. | Wound filler and method of manufacture |
| WO1997045079A1 (en) * | 1996-05-24 | 1997-12-04 | Coloplast A/S | A permanently deformable dressing |
| GB9618564D0 (en) * | 1996-09-05 | 1996-10-16 | Bristol Myers Squibb Co | Multi layered wound dressing |
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| US8269058B2 (en) * | 2002-06-14 | 2012-09-18 | Hemcon Medical Technologies, Inc. | Absorbable tissue dressing assemblies, systems, and methods formed from hydrophilic polymer sponge structures such as chitosan |
| US20050137512A1 (en) * | 2003-12-23 | 2005-06-23 | Campbell Todd D. | Wound dressing and method for controlling severe, life-threatening bleeding |
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| US20040071918A1 (en) * | 2002-10-07 | 2004-04-15 | Eli Cohen | Adhesive release film used in conjunction with adhesive backed material for attaching an object to a surface |
| US8100872B2 (en) | 2002-10-23 | 2012-01-24 | Tyco Healthcare Group Lp | Medical dressing containing antimicrobial agent |
| US7612248B2 (en) * | 2002-12-19 | 2009-11-03 | 3M Innovative Properties Company | Absorbent medical articles |
| WO2005074627A2 (en) * | 2004-02-02 | 2005-08-18 | Hydrophilix Corporation | Process for controlling the density, conformation and composition of the hydrophilic layer of a polyurethane composite |
| CA2587090C (en) * | 2004-09-21 | 2016-10-25 | Diapedia, L.L.C. | Method for design and manufacture of insoles |
| US20060189909A1 (en) * | 2005-02-24 | 2006-08-24 | Hurley Timothy B | Load relieving wound dressing |
| US9204957B2 (en) * | 2005-03-17 | 2015-12-08 | Hemcon Medical Technologies, Inc. | Systems and methods for hemorrhage control and or tissue repair |
| US20070163147A1 (en) * | 2005-09-21 | 2007-07-19 | Cavanagh Peter R | Method for Design and Manufacture of Insoles |
| AU2006294209A1 (en) † | 2005-09-26 | 2007-03-29 | Coloplast A/S | Bevelled foam |
| DE202006015547U1 (en) * | 2006-04-12 | 2007-01-18 | Riesinger, Birgit | Dressing for laying around a surgically applied cord from human or animal body opening or hole has a fleece mat which is interspersed with super absorber-particle and is surrounded by a liquid-permeable covering |
| JP2009538192A (en) | 2006-05-23 | 2009-11-05 | プロビデンス ヘルス システム−オレゴン ディー／ビー／エー プロビデンス セント ビンセント メディカル センター | System and method for introducing and applying a bandage structure within a body lumen or body hollow organ |
| ES2361025T3 (en) * | 2006-11-07 | 2011-06-13 | Paul Hartmann Ag | ABSORBENT BOTTOM OF MULTIPLE LAYERS WITH A HYDROPHYLE LAYER OF CONTACT WITH THE WOUND. |
| US8741158B2 (en) | 2010-10-08 | 2014-06-03 | Ut-Battelle, Llc | Superhydrophobic transparent glass (STG) thin film articles |
| US10150875B2 (en) | 2012-09-28 | 2018-12-11 | Ut-Battelle, Llc | Superhydrophobic powder coatings |
| SE531259C2 (en) * | 2007-06-27 | 2009-02-03 | Moelnlycke Health Care Ab | Device for treating reduced pressure ulcers |
| US9539149B2 (en) | 2007-07-13 | 2017-01-10 | Ut-Battelle, Llc | Superhydrophobic, diatomaceous earth comprising bandages and method of making the same |
| AU2009241687A1 (en) * | 2008-05-02 | 2009-11-05 | Providence Health System-Oregon D/B/A Providence St. Vincent Medical Center | Wound dressing devices and methods |
| KR101192947B1 (en) * | 2008-05-30 | 2012-10-18 | 케이씨아이 라이센싱 인코포레이티드 | Reduced-pressure, compression products and method for use on breast tissue |
| DE102008031182A1 (en) | 2008-07-03 | 2010-01-07 | Paul Hartmann Ag | Wound dressing with hydrogel matrix |
| DE102008031183A1 (en) | 2008-07-03 | 2010-01-07 | Paul Hartmann Ag | wound dressing |
| EP2340002B1 (en) | 2008-10-06 | 2015-03-25 | Providence Health System - Oregon | Foam medical devices and methods |
| US20110077608A1 (en) * | 2009-09-25 | 2011-03-31 | Macedo Jr Carlos Da Silva | Cushioned adhesive bandage |
| EP2338529B1 (en) | 2009-12-24 | 2013-05-29 | Paul Hartmann AG | Hydrogel matrix with improved adhesive characteristics |
| US11292919B2 (en) | 2010-10-08 | 2022-04-05 | Ut-Battelle, Llc | Anti-fingerprint coatings |
| US8497021B2 (en) | 2010-10-08 | 2013-07-30 | Ut-Battelle, Llc | Superoleophilic particles and coatings and methods of making the same |
| US9221076B2 (en) | 2010-11-02 | 2015-12-29 | Ut-Battelle, Llc | Composition for forming an optically transparent, superhydrophobic coating |
| US9828521B2 (en) | 2012-09-28 | 2017-11-28 | Ut-Battelle, Llc | Durable superhydrophobic coatings |
| WO2014081626A1 (en) * | 2012-11-20 | 2014-05-30 | 3M Innovative Properties Company | Laminates and articles comprising a block copolymer coating comprising polyorganosiloxane and polyolefin |
| WO2014143139A1 (en) | 2013-03-15 | 2014-09-18 | Bruder Healthcare Company | Wound and therapy compress and dressing |
| US20150239773A1 (en) | 2014-02-21 | 2015-08-27 | Ut-Battelle, Llc | Transparent omniphobic thin film articles |
| USD760396S1 (en) * | 2014-04-28 | 2016-06-28 | Advanced Medical Solutions Limited | Knee wound dressing |
| US12011388B2 (en) | 2016-03-01 | 2024-06-18 | The Hilsinger Company Parent, Llc | Therapeutic thermal compress with phase-change material |
| US12156831B2 (en) | 2016-03-01 | 2024-12-03 | The Hilsinger Company Parent, Llc | Therapeutic eye compress system |
| US12029681B2 (en) | 2016-03-01 | 2024-07-09 | The Hilsinger Company Parent, Llc | Therapeutic eye mask system |
| USD844795S1 (en) | 2016-11-30 | 2019-04-02 | Bruder Healthcare Company, Llc | Therapeutic eye mask |
| USD871598S1 (en) | 2016-11-30 | 2019-12-31 | Bruder Healthcare Company, Llc | Therapeutic eye mask |
| CN114767386A (en) * | 2022-04-26 | 2022-07-22 | 长沙海润生物技术有限公司 | Hydrogel eye protection patch and preparation method thereof |
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| GB888251A (en) * | 1957-09-06 | 1962-01-31 | Scholl Mfg Co Ltd | Improvements in or relating to wound dressing and method of making same |
| US3325366A (en) * | 1964-11-09 | 1967-06-13 | Seymour M Blaug | Biologically absorbable foam packing bandage and process therefor |
| CH528262A (en) * | 1969-07-15 | 1972-09-30 | Johnson & Johnson | Adhesive plaster |
| EP0099748B1 (en) * | 1982-07-21 | 1987-05-27 | Smith and Nephew Associated Companies p.l.c. | Adhesive wound dressing |
| DE3302984C2 (en) * | 1983-01-29 | 1986-05-22 | Sorbexx GmbH Gesellschaft für Adsorptionstechnik und Verbundstoffe, 8586 Gefrees | Wound cover material in sheet form |
| DK149601C (en) * | 1984-01-23 | 1987-02-02 | Coloplast As | PRESSURELY BANDAGE |
| GB8422950D0 (en) * | 1984-09-11 | 1984-10-17 | Warne K J | Hydrogel |
| US4810582A (en) * | 1985-11-12 | 1989-03-07 | Tyndale Plains-Hunter Ltd. | Hydrophilic polyurethane composition |
| US4733659A (en) * | 1986-01-17 | 1988-03-29 | Seton Company | Foam bandage |
| EP0235949A1 (en) * | 1986-02-18 | 1987-09-09 | Seton Company | Cohesive dressing |
| GB8605214D0 (en) * | 1986-03-03 | 1986-04-09 | Courtaulds Plc | Wound dressing |
| GB8617790D0 (en) * | 1986-07-21 | 1986-08-28 | Smith & Nephew Ass | Wound dressing |
| US4730611A (en) * | 1986-09-02 | 1988-03-15 | Absorbent Cotton Company | Medical dressing device |
| US4960594A (en) * | 1988-09-22 | 1990-10-02 | Derma-Lock Medical Corporation | Polyurethane foam dressing |
| GB2228682B (en) * | 1989-02-23 | 1992-08-12 | Ultra Lab Ltd | Wound dressing |
-
1989
- 1989-02-23 GB GB8904131A patent/GB2228682B/en not_active Expired - Lifetime
-
1990
- 1990-05-21 DK DK90305471.6T patent/DK0457977T3/en active
- 1990-05-21 EP EP90305471A patent/EP0457977B1/en not_active Expired - Lifetime
- 1990-05-21 AT AT90305471T patent/ATE118683T1/en not_active IP Right Cessation
- 1990-05-21 ES ES90305471T patent/ES2071017T3/en not_active Expired - Lifetime
- 1990-05-21 DE DE69017199T patent/DE69017199T2/en not_active Expired - Fee Related
- 1990-05-22 AU AU55760/90A patent/AU621754B1/en not_active Ceased
- 1990-05-28 CA CA002017683A patent/CA2017683C/en not_active Expired - Fee Related
- 1990-05-29 US US07/529,876 patent/US5154928A/en not_active Expired - Lifetime
-
1995
- 1995-04-17 GR GR950400971T patent/GR3015841T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU621754B1 (en) | 1992-03-19 |
| EP0457977B1 (en) | 1995-02-22 |
| GR3015841T3 (en) | 1995-07-31 |
| GB2228682A (en) | 1990-09-05 |
| DE69017199D1 (en) | 1995-03-30 |
| US5154928A (en) | 1992-10-13 |
| DE69017199T2 (en) | 1995-07-27 |
| GB2228682B (en) | 1992-08-12 |
| ATE118683T1 (en) | 1995-03-15 |
| ES2071017T3 (en) | 1995-06-16 |
| DK0457977T3 (en) | 1995-03-27 |
| GB8904131D0 (en) | 1989-04-05 |
| EP0457977A1 (en) | 1991-11-27 |
| CA2017683A1 (en) | 1991-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |